Say hello to Maybelline 0.65g Brow Natural Duo and goodbye to sparse eyebrow concerns. Easily define and fill the perfect brow shape for you in 2 easy steps. Waterproof & smudge-resistant. Try Mayelline’s Natural Brow Duo for full natural-looking eyebrows, their fastest all-in-one brow tool. This eyebrow duo has a precise triangular tip on one side that easily defines and shapes brows and a powder packed sponge on the other side that fills and smoothes, delivering brows that wow.